Yet another player to make a comeback is Nick Kyrgios. The reason he was out? The Australian was banned for eight weeks by the ATP tour in October for, essentially, a lack of effort.

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Photos:Tennis in 2017

In grand slams, he'll make his return in time for the Australian Open, Kyrgios' home major in Melbourne.

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Will Serena Williams surpass Steffi Graf and become the first player in the Open Era to win 23 majors?

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Williams -- yes -- is also coming back. The 35-year-old hasn't played since September because of a shoulder injury.

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Photos:Tennis in 2017

Will Novak Djokovic rediscover his mojo? Djokovic was tennis' top player in the first half of 2016 but tailed off considerably.

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Djokovic and coach Boris Becker parted company in early December, with the Serb not yet naming a replacement.

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How will Roger Federer fare in his comeback? And how will Maria Sharapova be received when she returns from her drug ban? We'll find out in what promises to be a fascinating 2017 in the world of tennis.